[Marginal] Delete useless file

.travis-yml

-language: cpp
-compiler:
-- clang
-- gcc
-env:
-global:
-- secure: "SnIBG/xLIHX3CSvUbqqsX8xTVqIqQ7fFS6HWO6KZQVBsT6yugTwYHbyhNiU531JejYJ/I3ZrDhXfYH3qFZiYxnH1sifvwV+fnTtMXpPN7qPZwIymkjcmm6gJF51e0C7VOfUbvKFv0ngwj+ul21rgZSMuoEvxPK0WxtE3/ZSfn9c="
-- APT_DEPENDENCIES="doxygen doxygen-latex libboost-all-dev libeigen3-dev liblapack-dev libblas-dev gfortran python-dev python-sphinx"
-- DEBSIGN_KEYID=5AE5CD75
-notifications:
-email:
-- hpp-source@laas.fr
-branches:
-only:
-- master
-- debian
-matrix:
-allow_failures:
-- compiler: clang
-script: ./.travis/run build
-after_success: ./.travis/run after_success
-after_failure: ./.travis/run after_failure
-before_install: ./.travis/run before_install
\ No newline at end of file